This is a reference to the fact, stated in the article, that Australia, Germany, Spain, and the Netherlands have ships of a similar design built by the same shipbuilder, which may also suffer from design flaws that allowed this one to sink so readily.
And for many of the navies these ships are the biggest most expensive and advanced vessels in the whole fleet. Imagine if the US Navy found out that Nimitz-class has a strange tendency to sink inexplicably
They don't sink, but unplanned time travel remains an issue.
They shouldn't have collided; they weren't paying attention.
They shouldn't have sunk; there wasn't that much damage but multiple critical structural systems failed which are present in many other ships from the same manufacturer.